Method for measuring adjacent areas

ABSTRACT

The present invention discloses a method for measuring adjacent cells, and the method is used for measuring adjacent cells by using dormant idle sub-frames to receive specified data from a network side in an idle state, and adjacent cells are measured by using an idle window to receive the specified data from the network side in a connection state. The present invention realizes measurement of the TD-SCDMA adjacent cells in a WCDMA mode and measurement of the WCDMA adjacent cells in a TD-SCDMA mode; and further more achieves reselection and switching from WCDMA to TD-SCDMA adjacent cell and from the TD-SCDMA to WCDMA adjacent cell on this basis, meets a real-time requirement effectively, and has high practical value.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage Application of PCT/CN2009/072821,filed Jul. 17, 2009, which designates the United States and claimspriority to Chinese Patent Application No. 200810132478.4, filed on Jul.17, 2008, and Chinese Patent Application No. 200810132295.2, filed onJul. 24, 2008.

FIELD OF THE INVENTION

The present invention relates to an adjacent cells measuring technology,and particularly to a method for measuring adjacent cells.

BACKGROUND OF THE INVENTION

A patent (WO2007147305) entitled “A METHOD FOR STARTING TD-SCDMA AND GSMDUAL MODE MOBILE TERMINAL” discloses a method for switching on aTD-SCDMA and WCDMA dual mode mobile terminal. This method is suitablefor various standby modes, using a solution of switching on the terminalsequentially in two modes of TD-SCDMA and WCDMA in dual standby statesand capable of avoiding mutual interference of the two modes uponswitching on the terminal.

A patent (WO2007143893) entitled “CALLING METHOD OF TD-SCDMA AND GSMDUAL-MODE MOBILE TERMINAL” discloses a method for switching off aTD-SCDMA and WCDMA dual mode mobile terminal. This method is suitablefor various standby modes, using a solution of switching off theterminal sequentially in two modes of TD-SCDMA and WCDMA in dual standbystates and capable of avoiding mutual interference of the two modes uponswitching off the terminal.

However, currently there are not definite regulations or standards thatspecify a method for measuring TD-SCDMA adjacent cells in the WCDMA modeand a method for measuring WCDMA adjacent cells in the TD-SCDMA mode.

SUMMARY OF THE INVENTION

The present invention aims to provide a method for measuring adjacentcells to realize measuring TD-SCDMA adjacent cells in the WCDMA mode andmeasuring WCDMA adjacent cells in the TD-SCDMA mode.

The present invention provides a method for measuring adjacent cells,which is adapted to measure TD-SCDMA adjacent cells in a WCDMA mode whenTD-SCDMA timing has not been obtained, wherein a terminal in an idlestate uses dormant idle WCDMA sub-frames to receive data of TD-SCDMAadjacent cells specified by a network side so as to measure the TD-SCDMAadjacent cells, and in a connection state uses an idle window of theWCDMA subframes to receive data of TD-SCDMA adjacent cells specified bythe network side so as to measure the TD-SCDMA adjacent cells, andparticularly the method comprises the following steps:

step A, receiving the data of the TD-SCDMA adjacent cells, performingautomatic gain control adjustment and coarse synchronization adjustmentof frequency points of the TD-SCDMA adjacent areas, thereby obtaining astable automatic gain control value of one frequency point, and thesuccess of the coarse synchronization of the frequency point;

step B, receiving data relevant to a downlink synchronization codeaccording to a coarse synchronization position, finding out a positionwhere a relevant peak is the highest which is to be used as a TD-SCDMAtiming, and determining an observation time difference of all theTD-SCDMA adjacent cells with respect to the TD-SCDMA timing under thefrequency point; and

step C, receiving data in the 0th time slot relevant to a trainingsequence code under the frequency point according to the TD-SCDMAtiming, which is for calculating a received signal code power of theTD-SCDMA adjacent cells whose observation time difference has beenobtained, wherein the present step is performed three times and anaverage value of the measurements of the received signal code powers ofthe three times is reported to the network side.

Further, the idle window is formed in a compress mode; the pattern ofthe compress mode is specified by the network side, particularlycomprising: the number, the position and the length of the idle window,and the number of TD-SCDMA frames using the idle window.

Further, in step A, if the coarse synchronization of all the frequencypoints of the TD-SCDMA adjacent cells can not succeed, the terminalreports to the network side the minimum value as the received signalcode powers of all the TD-SCDMA adjacent cells.

Preferably, in step A, performing coarse synchronization to onefrequency point of the TD-SCDMA adjacent cells requires receiving dataof the TD-SCDMA adjacent cells once.

Preferably, the amount of the data of the TD-SCDMA adjacent cells isreceived with a length of 1 frame plus 128 chips at every time.

The present invention also provides a method for measuring adjacentcells, which is adapted to measure TD-SCDMA adjacent cells in a WCDMAmode when TD-SCDMA timing has been obtained, wherein a terminal in anidle state uses dormant idle WCDMA sub-frames to receive data ofTD-SCDMA adjacent cells specified by a network side so as to measure theTD-SCDMA adjacent cells, and in a connection state uses an idle windowof the WCDMA sub-frames to receive data of TD-SCDMA adjacent cellsspecified by the network side so as to measure the TD-SCDMA adjacentcells, and particularly the method comprises the following steps:

step a, receiving the data of the TD-SCDMA adjacent cells, performingautomatic gain control adjustment of one frequency point of the TD-SCDMAadjacent cells, thereby obtaining a stable automatic gain control valueof the frequency point;

step b, receiving data relevant to a downlink synchronization code, anddetermining an observation time difference of all the TD-SCDMA adjacentcells with respect to the TD-SCDMA timing under the frequency point; and

step c, receiving data in the 0th time slot relevant to a trainingsequence code under the frequency point according to the TD-SCDMAtiming, which is for calculating a received signal code power of theTD-SCDMA adjacent cells whose observation time difference has beenobtained, wherein steps b-c are performed three times and an averagevalue of the measurements of received signal code powers of the threetimes is reported to the network side.

Further, the idle window is formed in a WCDMA compress mode; the patternof the compress mode is specified by the network side, particularlycomprising: the number, the position and the length of the idle window,and the number of TD-SCDMA frames using the idle window.

The present invention also provides a method for measuring adjacentcells, which is adapted to measure WCDMA adjacent cells in a TD-SCDMAmode, wherein a terminal in an idle state uses dormant idle TD-SCDMAsub-frames to receive data of WCDMA adjacent cells specified by anetwork side so as to measure the WCDMA adjacent cells, and in aconnection state or a high speed downlink packet access state uses anidle window of the TD-SCDMA sub-frames to receive data of WCDMA adjacentcells specified by the network side so as to measure the WCDMA adjacentcells, and particularly the method comprises the following steps:

step A, receiving data of the WCDMA adjacent cells, performingsynchronization processing of time slot, and determining a time slotsynchronization point;

step B, determining a secondary synchronization sequence group of a cellaccording to a scramble code number of the WCDMA adjacent cells;

step C, determining a start-position of a WCDMA frame; and

step D, taking ten consecutive symbols obtained by de-spreading a commonpilot channel and then calculating a received signal code power.

Further, there are two idle time slots in the idle windows of theTD-SCDMA subframes in the connection state; and there are the 0th timeslot and a downlink pilot time slot in the TD-SCDMA subframes in thehigh speed downlink packet access state.

Further, prior to step A, the method further comprises the followingsteps: receiving measuring adjacent cells information sent from thenetwork side, wherein the scramble code numbers and the frequency pointsof the WCDMA adjacent cells to be measured this time are specified.

Preferably, the procedure of the time slot synchronization fordetermining the time slot synchronization point particularly comprises:receiving the data of the WCDMA adjacent cells with a length of 1 timeslot plus 256 chips, and correlating the data with a local primarysynchronization code to obtain a correlation result of 1 time slot, anddetermining the time slot synchronization point according to the peak ofthe correlation result.

Preferably, the procedure of determining the start-position of the WCDMAframe is as follows: in the idle state, the data of 15 continuous timeslots of the WCDMA adjacent cells is received according to thedetermined time slot synchronization point, and the first 256 chips aretaken out from each time slot to constitute a sequence A; the sequence Ais correlated sequentially with 15 secondary synchronization sequencesof the WCDMA adjacent cells, a sliding step length is 256 chips, and thestart-position of the WCDMA frame is determined according to the peak of15 correlation results; or in the connection state or the high speeddownlink packet access state, the data of one time slot of the WCDMAadjacent cells is received according to the time slot synchronizationpoint, and the data is correlated with each sequences in the secondarysynchronization sequence group of the cell, and if time slot numbercorresponding to the peak of the correlation results is one, thestart-position of the WCDMA frame is determined by the time slot number;if time slot number determined is two, then the data of one time slot ofthe WCDMA adjacent cells is received again, and the two determined timeslot numbers respectively plus the number of the time slots of the gapbetween the two receptions to obtain two possibilities of the time slotnumber of the data received this time, and the data received this timeis correlated with the secondary synchronization sequences correspondingto the two possible time slot numbers, and the time slot number of thedata received this time is determined according to the peak of thecorrelation results and the position where the WCDMA frame head appearsis determined according to the time slot number.

Further, after step D, the method further comprises: repeating step D,and then reporting to a higher layer the average value of themeasurements of the received signal code powers of two times.

Further, in step D, the de-spreading is performed according to thechannelization code and the primary scrambling code specifically used bythe common pilot channel (i.e. CPICH).

The present invention receive data specified by a network side usingdormant idle frames to measures adjacent cells in an idle state andreceive data specified by the network side using an idle window(compress gap) to measures adjacent cells in a connection state, andthus realizes adjacent cells measurement of the TD-SCDMA in a WCDMA modeand adjacent cells measurement of the WCDMA in a TD-SCDMA mode; and alsoachieves reselection and switching of the WCDMA to TD-SCDMA adjacentcells and the TD-SCDMA to WCDMA adjacent cells on this basis, meets areal-time requirement effectively, and has high practical value.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of the first method for measuring the TD-SCDMAadjacent cells in a WCDMA mode of the present invention;

FIG. 2 is a flow chart of the second method for measuring the TD-SCDMAadjacent cells in a WCDMA mode proposed by the present invention;

FIG. 3 is a schematic view of the measuring process of the frequencypoints in the second method of the present invention;

FIG. 4 is a flow chart of the method for measuring the WCDMA adjacentcells in the TD-SCDMA mode proposed by the present invention;

FIG. 5 is a schematic view of the data needed to receive in the steps ofthe present invention using TD-SCDMA idle time slots in a TD-SCDMAconnection state/HSDPA state;

FIG. 6 is a schematic view of the idle window in the TD-SCDMA subframesin the TD-SCDMA connection state/HSDPA state; and

FIG. 7 is a schematic view of a data length corresponding to the idlewindow shown in FIG. 3 in a WCDMA frame.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The core concept of the present invention is to use dormant idle framesto receive data specified by a network side to measure adjacent cells inan idle state and to use an idle window to receive data specified by anetwork side to measure adjacent cells in a connection state.

The specific process of realizing the present invention will be furtherdescribed in detail hereinafter in conjunction with the accompanyingdrawings. For the convenience of description, the measurement ofTD-SCDMA adjacent cells in the WCDMA mode and the measurement of WCDMAadjacent cells in the TD-SCDMA mode will be respectively described.

When TD-SCDMA adjacent cells are measured in the WCDMA mode, a terminalin an idle state uses dormant WCDMA sub-frames to receive the data ofthe TD-SCDMA adjacent cells specified by the network side to measure theTD-SCDMA adjacent cells, and in a connection state uses an idle windowof the WCDMA subframes to receive the data of the TD-SCDMA adjacentcells specified by the network side to measure the TD-SCDMA adjacentcells, thereby ensuring the realization of measuring the TD-SCDMAadjacent cells in the WCDMA mode.

There are two situations of measuring the TD-SCDMA adjacent cells in theWCDMA mode: the first one is applicable to a situation in which TD-SCDMAtiming has not been obtained, which is referred to as the first WCDMAmode; and the second one is applicable to a situation in which theTD-SCDMA timing has been obtained, which is referred to as the secondWCDMA mode, and they will be described hereinafter respectively.

Here it needs to be explained that the measurement between a WCDMAsystem and TD supports measurement of 32 cells at most, and the 32 cellscomprise at most 3 Time Division Duplex (TDD) frequency points.

Referring to FIG. 1, it is a flow chart of the first method formeasuring the TD-SCDMA adjacent cells in a WCDMA mode of the presentinvention. In this method, the terminal in the idle state uses dormantidle frames to receive data to measure the TD-SCDMA adjacent cells, andin a connection state uses an idle window (compress gap) formed in acompress mode to receive data to measure the TD-SCDMA adjacent cells.The specific realization process is as follows:

Step 10, the network side sends to the terminal a compress mode patternused for TDD mode measurement in the connection state.

The content of the pattern comprises the number, the position and thelength of the idle window formed in a compress mode in 1 TD-SCDMA frame,and the number of TD-SCDMA frames using the idle window formed in thecompress mode. The pattern is accurately represented by parameters ofTGSN (Transmission Gap Starting Slot Number), TGL1 (Transmission GapLength 1), TGL2 (Transmission Gap Length 2), TGD (Transmission Gap startDistance), TGPL1 (Transmission Gap Pattern Length), TGPRC (TransmissionGap Pattern Repetition Count) and TGCFN (Transmission Gap ConnectionFrame Number).

Step 11, the terminal tries coarse synchronization at the firstfrequency point.

Step 12, the terminal switches a radio frequency to the frequency pointthat prepares to try the coarse synchronization.

Step 13, the terminal receives TD-SCDMA data several times (currently itis set to be 4), and in the idle state uses dormant idle frames toreceive the data and in the connection state uses the idle window formedin the compress mode to receive the data, for automatic gain control(AGC) adjustment, until a stable AGC value of the frequency point isobtained.

Step 14, the terminal receives the TD-SCDMA data once, and in the idlestate uses dormant idle frames to receive the data and in the connectionstate uses the idle window formed in the compress mode to receive thedata, and configures through sliding relevant algorithm the coarsesynchronization in the idle window which can completely receive the dataof 1 TD-CDMA frame plus 128 chips, and if successful, it turns to step17, and otherwise it turns to step 15.

Step 15, the terminal judges whether there is any frequency point thathas not tried the coarse synchronization, and if there is, it isprepared to try this frequency point and returns to step 12, andotherwise it turns to step 16.

Step 16, the terminal reports to the network side the minimum value asthe received signal code powers (RSCP) of all the TD-SCDMA adjacentcells.

Step 17, the terminal receives data of a 128 chip length relevant to adownlink synchronization code (sync_dl) according to a coarsesynchronization position, and the terminal in the idle state uses thedormant idle frames to receive the data and in a connection state usesthe idle window formed in the compress mode to receive the data, andfinds out a position where the highest relevant peak is located afterthe downlink synchronization codes fall into the idle window completelyand obtains a frame head as the TD-SCDMA timing according to theposition. Since the TD-SCDMA system is a synchronous system, if thetiming of one cell (that is, the position of the frame head of the cell)is found, it is deemed that the timing of the overall TD-SCDMA system isobtained.

Step 18, the terminal determines an observation time difference (OTD) ofall the TD-SCDMA adjacent areas with respect to the TD-SCDMA timingunder the frequency points whose coarse synchronization is successful.

Step 19, according to the TD-SCDMA timing the terminal receives datarelevant to a training sequence (midamble) code in the 0th time slot(i.e. TS0) under the frequency points whose coarse synchronization issuccessful, and in the idle state uses dormant idle frames to receivethe data and in the connection state uses the idle window formed in thecompress mode to receive the data, and in the case that the receiveddata all falls within the idle window, the RSCP of the TD-SCDMA adjacentcells whose OTD has been obtained is determined according to thereceived midamble relevant data.

Step 20, it is judged whether step 19 has been performed three times,and if so, the next step will be executed, and if not, it returns tostep 19.

Step 21, the terminal reports to the network side the average value ofthe measurements of RSCP of three times.

In step 19, due to the restriction of the processing ability of an RSCPmodule, the terminal can determine the RSCPs of four adjacent cells viathe data relevant to the midambl code received by the RSCP module everytime, and thus if the number of the TD-SCDMA adjacent cells under acertain frequency point is larger than four, the RSCP module needs toperform the reception and calculation multiple times until obtaining theRSCP measurements of all the TD-SCDMA adjacent cells under the frequencypoint.

The above method describes the flow that the terminal measures theTD-SCDMA adjacent cells in the WCDMA mode in the situation in which theTD-SCDMA timing has not been obtained, while the method can only measureall the TD-SCDMA adjacent cells under one frequency point whose coarsesynchronization is successful, and the TD-SCDMA adjacent cells under theother frequency points are measured using the following method.

Referring to FIG. 2, it is a flow chart of the second method formeasuring the TD-SCDMA adjacent cells in the WCDMA mode of the presentinvention. In this method, the terminal in the idle state uses dormantidle frames to receive data to measure the TD-SCDMA adjacent cells, andin the connection state uses an idle window formed in the compress modeto receive data to measure the TD-SCDMA adjacent cells. The specificrealization process is as follows:

Step 30, the network side sends to the terminal a compress mode patternused for the measurement of TDD mode in the connection state.

The content of the pattern comprises the number, the position and thelength of the idle window formed in the compress mode in one TD-SCDMAframe, and the number of TD-SCDMA frames using the idle window formed inthe compress mode. The pattern is accurately represented by parametersof TGSN (Transmission Gap Starting Slot Number), TGL1 (Transmission GapLength 1), TGL2 (Transmission Gap Length 2), TGD (Transmission Gap startDistance), TGPL1

(Transmission Gap Pattern Length), TGPRC (Transmission Gap PatternRepetition Count) and TGCFN (Transmission Gap Connection Frame Number).

Step 31, the terminal selects the first frequency point that needs tocalculate the RSCP.

Step 32, the terminal switches a radio frequency to the frequency pointselected this time.

Step 33, the terminal receives TD-SCDMA data several times (currently itis set to be 4), and in the idle state uses dormant idle frames toreceive the data and in the connection state uses the idle window formedin the compress mode to receive the data for AGC adjustment, and obtainsa stable AGC value of the frequency point selected this time.

Step 34, the timing of a TD-SCDMA system is obtained.

In this step, the terminal uses a downlink synchronization tracking(DST) module to generate the timings of several (currently it is 4)TD-SCDMA cells, and since the TD-SCDMA system is a synchronous system,if the timing of one cell is obtained, it is deemed that the timing ofthe overall TD-SCDMA system is obtained.

Step 35, the terminal receives data of 128 chip length relevant to async_dl code, and the terminal in the idle state uses the dormant idleframes to receive the data and in a connection state uses the idlewindow formed in the compress mode to receive the data, and the receivedsync_dl code is used to determine the OTD of all the TD-SCDMA adjacentcells with respect to the TD-SCDMA timing under the frequency pointselected this time.

Step 36, according to the obtained TD-SCDMA timing the terminal receivesdata relevant to a midambl code in the 0th time slot (i.e. TS0) underthe frequency point selected this time, and in the idle state usesdormant idle frames to receive the data and in the connection state usesthe idle window formed in the compress mode to receive the data, andthus the RSCP of the TD-SCDMA adjacent cells whose OTD has been obtainedis determined.

Step 37, it is judged whether steps 35 to 36 have been performed threetimes, and if so, the next step will be executed, and if not, it returnsto step 35.

Step 38, the terminal judges whether there are other frequency pointswhose RSCPs have not been calculated, and if there are, the frequencypoints are selected, and then it returns to step 32, otherwise the nextstep will be executed.

Step 39, the terminal reports to the network side all the RSCPmeasurements of all the frequency points.

In the above flow, step 35 is completed by the DST module, and step 36is completed by the RSCP module. Due to the restriction of theprocessing ability, the terminal can only determine the OTDs of fourTD-SCDMA cells with respect to the TD-SCDMA timing under the presentfrequency point through the data relevant to the sync_dl code receivedby the DST module every time; and the terminal can only determine theRSCPs of four TD-SCDMA adjacent areas whose OTDs have been obtainedthrough the data relevant to the midambl code received by the RSCPmodule every time. To improve the efficiency, the terminal can receivethe data relevant to the midambl code in the 0th time slot (i.e. TS0)and the data relevant to the sync_dl at one time, and thus the DSTmodule and the RSCP module can process in parallel, and as shown in FIG.3, that is, when the DST module is calculating the OTDs of a new groupof four cells, the RSCP module is calculating the RSCPs of the lastgroup of 4 cells whose OTDs have been obtained at the same time.

When WCDMA adjacent cells are measured in the TD-SCDMA mode, theterminal in the idle state uses dormant TD-SCDMA sub-frames to receivedata of the WCDMA adjacent cells specified by the network side so as tomeasure the WCDMA adjacent cells, and in the connection state or thehigh speed downlink packet access state uses the idle window of theTD-SCDMA subframes to receive data of the WCDMA adjacent cells specifiedby the network side so as to measure the WCDMA adjacent cells, therebyensuring the realization of measuring the WCDMA adjacent cells in theTD-SCDMA mode.

A user equipment (UE) in the TD-SCDMA system measures 32 frequencydivision duplex (FDD) cells at most, which is with at most 3 FDDfrequency points.

The measurement period of the UE in the connection state/high speeddownlink packet access (HSDPA) state in the TD-SCDMA system is 480 ms,and the measurement period of the UE in the idle state in the TD-SCDMAsystem is represented by the following table:

DRX (Discontinuous Reception) Measurement period cycle length (DRX cyclenumber) Unit s Unit s 0.08 0.64 (4) 0.16 1.28 (4) 0.32 1.28 (2) 0.641.28 (1) 1.28 1.28 (1) 2.56 2.56 (1) 5.12 5.12 (1)

Referring to FIG. 4, it is an outline flow chart of the method formeasuring the WCDMA adjacent cells in the TD-SCDMA mode of the presentinvention, and the main implementation process is as follows:

Step 40, the network side sends to the UE information of the WCDMAadjacent cells needed to measure, wherein the scramble code numbers andthe frequency points of the WCDMA adjacent cells measured this time arespecified.

Step 41, the UE receives the data of the WCDMA adjacent cells measuredthis time with length of 1 time slot plus 256 chips and correlates itwith a local primary synchronization (P-SCH) code (256 chip, the overallTD-SCDMA network uses the same P-SCH code) to obtain a correlationresult of 1 time slot, and determines the time slot synchronizationpoint according to the peak of the correlation result.

Step 42, according to the scramble code numbers of the WCDMA adjacentcells measured this time, the UE can know the group number among the 64scrambling code groups that the cell belongs to, that is, the scramblingcode group number can be obtained, and 15 secondary synchronizationsequences used in one frame is determined according to the scramblingcode group number.

Step 43, the UE determines the start-position of a WCDMA frame.

In the idle state, the UE can directly uses a frame synchronizationalgorithm for adjacent cells measurement in the WCDMA mode to determinethe start-position of a WCDMA frame, and one frame of WCDMA data needsto be received, and in the connection state/HSDPA state, since there isnot enough radio frequency idle time, the frame synchronizationalgorithm for the adjacent cells measurement can not be directly used,and a new algorithm needs to be designed according to the idleness ofthe time slots in the TD-SCDMA subframes to complete framesynchronization.

Step 44, according to the channelization code C₂₅₆ ⁰ and a primaryscrambling code specifically used by a CPICH (Common Pilot Channel), theUE de-spreads the CPICH and uses ten consecutive symbols obtained afterthe de-spreading, to calculate the RSCP received signal code power.

Step 45, the UE judges whether step 44 has been executed twice, and ifyes, the next step will be executed, and otherwise it returns to step44.

Step 46, the UE reports to a higher layer the average value of themeasurements of the received signal code powers of two times.

In the above flow, when the UE is in the idle state, the presentinvention completes measuring the RSCP of the WCDMA adjacent cells in amanner of configuring the measurement of the WCDMA adjacent cells at thedormant TD-SCDMA sub-frames within a paging interval, and this takestime of a few frames, and can totally meet the requirement of themeasurement period in the idle state above.

While in the connection state/HSDPA state, the present inventioncompletes measuring the RSCP of the WCDMA adjacent areas in a manner ofconfiguring the measurement of the WCDMA adjacent areas in the idle timeslots in the TD-SCDMA subframes.

Hereinafter, the existence of the idle time slots in the TD-SCDMAsubframes in the connection state/HSDPA state will be analyzed first.Supposing the TD-SCDMA subframes support 2 transmit time slots, ts0 isused to receive a broadcast channel (BCH) and RSCP measurements, and fordifferent TD-SCDMA services, the existence of the idle time slots in theTD-SCDMA subframes are respectively as follows:

1) for voice services of 12.2 k and 64 k, generally there is 1 receivingtime slot and 1 transmit time slot, and thus there are 4 idle timeslots;

2) for a downlink service of 144 k, generally there are 2 receiving timeslots and 1 transmit time slot, and thus there are 3 idle time slots;

3) for a downlink service of 384 k, generally there are 3 receiving timeslots and 1 transmit time slot, and thus there are 2 idle time slots;and

4) for an HSDPA service, there is no idle time slot at a peak rate.

Configuring the WCDMA adjacent areas measurement in the connectionstate/HSDPA state, firstly it needs to consider the normal receiving andtransmitting of TD-SCDMA services; and then to consider the measurementconfiguration within the TD-SCDMA system, and relevant measurement ofthe RSCP of the TD-SCDMA adjacent areas needs to be configured at theTS0, and relevant measurement of interference signal code power (ISCP)of the TD-SCDMA services is performed at a service time slot.

Owing to the above description, for the configuration position of theWCDMA measurement, firstly, it needs to consider configuring the WCDMAadjacent areas measurement at the above idle time slots, and secondly,to consider using the TS0 time slot as possible as to configure theWCDMA adjacent areas measurement, which is of great importance to theWCDMA adjacent areas measurement in the HSDPA state.

Referring to FIG. 5, it is a schematic view of receiving the data neededin the steps of the present invention using TD-SCDMA idle time slots inthe TD-SCDMA connection state/HSDPA state, and the steps will bedescribed hereinafter respectively.

In the step of time slots synchronization, the data with a length of 1time slot plus 256 chip that needs to be received is about0.66+0.013=0.673 ms which then plus the time of switching frequencypoints and it does not exceed the length of 1 TD-SCDMA time slot(864/1.28M=0.675 ms), and it is thus seen that using 1 TD-SCDMA timeslot can complete time slot synchronization for one time.

In the step of frame synchronization, 2560 chip of WCDMA data needs tobe received, and in the connection state the idle window consisting of 2time slots can receive the data for one time, and 1 frame completes theframe-synchronization for one time; in the HSDPA state, using TS0+Dwpts(downlink pilot time slot) can receive the data for one time, and 1frame completes the frame-synchronization for one time.

In step of calculating the RSCP, data relevant to 10 symbols needs to bereceived, whose length is the data of 1 WCDMA time slot length, beingabout 10/15 ms=0.66 ms which plus the switching time of the frequencypoints, and it does not exceed the length of 1 TD-SCDMA time slot (0.675ms), and since the RSCP calculation needs sampling twice, then this stepneeds two TD-SCDMA time slots.

Owing to the above description, except the HSDPA state, in theconnection state, each TD-SCDMA subframe at least has 2 idle time slots,and then 3 frames can complete measuring all the WCDMA adjacent cellsunder one frequency point, and one measurement period (480 ms) is about96 frames which is enough for completing the measurement of the WCDMAadjacent cells; while in the HSDPA state, considering that themeasurement is made at TS0+DwPTS, 3 frames can complete measuring allthe WCDMA adjacent cells under one frequency point. In one measurementperiod (480 ms), the TS0 is firstly used to receive the BCHs of aserving cell and the adjacent areas and also performs intra-frequencymeasurement; secondly, the TS0 is also used to configure inter-frequencymeasurement within the TD-SCDMA system; finally at the TS0 the WCDMAadjacent cells measurement is configured. Upon rough estimation, thereare tens of frames in the HSDPA mode for the WCDMA measurement, whichare enough to complete the measurement of WCDMA adjacent cells.

Hereinafter the frame-synchronization algorithm used in the idle stateand the connection state/HSDPA state will be described respectively.

In the idle state, the specific process of determining thestart-position of the WCDMA frame is as follows:

1) according to the time slot synchronization point, the data of 15continuous time slots of the WCDMA adjacent cell measured this time isreceived, and the first 256 chips are taken out from each time slot toconstitute a sequence A;

2) the sequence A is sequentially correlated with 15 secondarysynchronization sequences of the WCDMA adjacent cells measured thistime, and each sliding step is 256 chips, and 15 correlation results areobtained; and

3) according to the peak of 15 correlation results, the start-positionof the WCDMA frame is determined.

FIG. 6 is a schematic view of the idle window in the TD-SCDMA subframesin the connection state/HSDPA state, and FIG. 7 is a schematic view of adata length in the WCDMA frame corresponding to the idle window shown inFIG. 6, and the idle window in the TD-SCDMA subframes is analyzed asfollows:

In the connection state, there exist 2 idle time slots in an idle windowof the TD-SCDMA sub-frame and the size of the idle window is Zt=1728TDchip which is about 5184 Wchip, i.e. Zw=5184 Wchip, at leastcomprising 2-3 WCDMA time slot heads.

In the HSDPA state, WCDMA measurement is performed using the idleTS0+Dwpts in the TD-SCDMA subframes as the idle window, and the size ofthe idle window is Zt=992 TDchip which is about 2976 Wchip, i.e. Zw=2976Wchip, at least comprising 2 WCDMA time slot heads.

Hence, in the connection state/HSDPA state, 1 complete WCDMA time slotmust be received at the idle window of 1 TD-SCDMA subframe. Since theWCDMA frame has a length of 10 ms while the TD-SCDMA subframes have alength of 5 ms, after the WCDMA data of the M^(th) time slot has beenreceived in one TD-SCDMA subframe, the WCDMA data of the (M+7)^(th) timeslot will be received in an immediately following TD-SCDMA subframe.Thus, in the connection state/HSDPA state, the following algorithms canbe used to determine the start-position of the WCDMA frame:

1) the data of one time slot of the WCDMA adjacent cells measured thistime is received according to the time slot synchronization point, andthe data is correlated with each sequence of the secondarysynchronization sequence group of the cell, and the start-position ofthe WCDMA frame is determined if one time slot number is determinedaccording to the peak of the correlation results; otherwise the nextstep is executed; and

2) if two time slot numbers are determined, the data of one time slot ofthe WCDMA adjacent cells is received again according to the time slotsynchronization point, and the determined two time slot numbersrespectively plus the number of the time slots of the gap between thetwo receiving, and then two possibilities of the time slot number of thedata received this time is obtained, and the data received this time iscorrelated with the secondary synchronization sequences corresponding tothe time slot numbers of the two possibilities, and the time slot numberof the data received this time is determined according to the peak ofthe correlation results and the start-position of WCDMA frame is thendetermined according to the time slot number.

If a repetition policy is considered, the following improvements can bemade:

First, M TD-SCDMA subframes are used to receive the WCDMA data for Mtimes, and M is an integer larger than 2, and step 1) is executed, andwhether to execute step 2) is judged after integrating the M results;

If step 2) is to be executed, then M TD-SCDMA subframes are used toreceive the WCDMA data for M times again, step 2) is executed, and thetime slot number can be obtained by integrating the M results afterjudgment.

Obviously, one skilled in the art can make various modifications andvariations to the present invention without departing from the spiritand the scope of the present invention. In this way, if themodifications and variations to the present invention fall within thescope of the claims of the present invention and the equivalenttechniques thereof, the present invention also intends to contain suchmodifications and variations.

INDUSTRIAL APPLICABILITY

By measuring adjacent cells using the dormant idle frames to receivedata specified by the network side in the idle state and by measuringadjacent cells using the idle window to receive the data specified bythe network side in the connection state, the present invention realizesthe TD-SCDMA adjacent cells measurement in the WCDMA mode and the WCDMAadjacent cells measurement in the TD-SCDMA mode; and also achievesreselection and switching of the WCDMA to adjacent cells of the TD-SCDMAand the TD-SCDMA to adjacent cells of the WCDMA on this basis, meets areal-time requirement effectively, and has high industrialapplicability.

1. A method for measuring adjacent cells, which is adapted to measureTD-SCDMA adjacent cells in a WCDMA mode when TD-SCDMA timing has notbeen obtained, wherein a terminal in an idle state uses dormant idleWCDMA sub-frames to receive data of TD-SCDMA adjacent cells specified bya network side so as to measure the TD-SCDMA adjacent cells, and in aconnection state uses an idle window of the WCDMA subframes to receivedata of TD-SCDMA adjacent cells specified by the network side so as tomeasure the TD-SCDMA adjacent cells, and particularly the methodcomprises the following steps: step A, receiving the data of theTD-SCDMA adjacent cells, performing automatic gain control adjustmentand coarse synchronization adjustment of frequency points of theTD-SCDMA adjacent areas, thereby obtaining a stable automatic gaincontrol value of one frequency point, and the success of the coarsesynchronization of the frequency point; step B, receiving data relevantto a downlink synchronization code according to a coarse synchronizationposition, finding out a position where a relevant peak is the highestwhich is to be used as a TD-SCDMA timing, and determining an observationtime difference of all the TD-SCDMA adjacent cells with respect to theTD-SCDMA timing under the frequency point; and step C, receiving data inthe 0th time slot relevant to a training sequence code under thefrequency point according to the TD-SCDMA timing, which is fordetermining a received signal code power of the TD-SCDMA adjacent cellswhose observation time difference has been obtained, wherein the presentstep is performed three times and an average value of the measurementsof the received signal code powers of the three times is reported to thenetwork side.
 2. The method according to claim 1, wherein the idlewindow is formed in a compress mode; the pattern of the compress mode isspecified by the network side, particularly comprising: the number, theposition and the length of the idle window, and the number of TD-SCDMAframes using the idle window.
 3. The method according to claim 1,wherein, in step A, if the coarse synchronization of all the frequencypoints of the TD-SCDMA adjacent cells can not succeed, the terminalreports to the network side the minimum value as the received signalcode powers of all the TD-SCDMA adjacent cells.
 4. The method accordingto claim 1, wherein, in step A, performing coarse synchronization to onefrequency point of the TD-SCDMA adjacent cells requires receiving dataof the TD-SCDMA adjacent cells once.
 5. The method according to claim 4,wherein the amount of the data of the TD-SCDMA adjacent cells is:received with a length of 1 frame plus 128 chips at every time.
 6. Amethod for measuring adjacent cells, which is adapted to measureTD-SCDMA adjacent cells in a WCDMA mode when TD-SCDMA timing has beenobtained, wherein a terminal in an idle state uses dormant idle WCDMAsub-frames to receive data of TD-SCDMA adjacent cells specified by anetwork side so as to measure the TD-SCDMA adjacent cells, and in aconnection state uses an idle window of the WCDMA sub-frames to receivedata of TD-SCDMA adjacent cells specified by the network side so as tomeasure the TD-SCDMA adjacent cells, and particularly the methodcomprises the following steps: step a, receiving the data of theTD-SCDMA adjacent cells, performing automatic gain control adjustment ofone frequency point of the TD-SCDMA adjacent cells, thereby obtaining astable automatic gain control value of the frequency point; step b,receiving data relevant to a downlink synchronization code, anddetermining an observation time difference of all the TD-SCDMA adjacentcells with respect to the TD-SCDMA timing under the frequency point; andstep c, receiving data in the 0th time slot relevant to a trainingsequence code under the frequency point according to the TD-SCDMAtiming, which is for determining a received signal code power of theTD-SCDMA adjacent cells whose observation time difference has beenobtained, wherein steps b-c are performed three times and an averagevalue of the measurements of received signal code powers of the threetimes is reported to the network side.
 7. The method according to claim6, wherein the idle window is formed in a WCDMA compress mode; thepattern of the compress mode is specified by the network side,particularly comprising: the number, the position and the length of theidle window, and the number of TD-SCDMA frames using the idle window. 8.A method for measuring adjacent cells, which is adapted to measure WCDMAadjacent cells in a TD-SCDMA mode, wherein a terminal in an idle stateuses dormant idle TD-SCDMA sub-frames to receive data of WCDMA adjacentcells specified by a network side so as to measure the WCDMA adjacentcells, and in a connection state or a high speed downlink packet accessstate uses an idle window of the TD-SCDMA subframes to receive data ofWCDMA adjacent cells specified by the network side so as to measure theWCDMA adjacent cells, and particularly the method comprises thefollowing steps: step A, receiving data of the WCDMA adjacent cells,performing synchronization processing of time slot, and determining atime slot synchronization point; step B, determining a secondarysynchronization sequence group of a cell according to a scramble codenumber of the WCDMA adjacent cells; step C, determining a start-point ofa WCDMA frame; and step D, taking ten consecutive symbols obtained byde-spreading a common pilot channel and then calculating a receivedsignal code power.
 9. The method according to claim 8, wherein there aretwo idle time slots in the idle windows of the TD-SCDMA subframes in theconnection state; and there are the 0th time slot and a downlink pilottime slot in the TD-SCDMA subframes in the high speed downlink packetaccess state.
 10. The method according to claim 8, wherein, prior tostep A, the method further comprises the following steps: receivingmeasuring adjacent cells information sent from the network side, whereinthe scramble code numbers and the frequency points of the WCDMA adjacentcells to be measured this time are specified.
 11. The method accordingto claim 8, wherein the procedure of the time slot synchronization fordetermining the time slot synchronization point particularly comprises:receiving the data of the WCDMA adjacent cells with a length of 1 timeslot plus 256 chips, and correlating the data with a local primarysynchronization code to obtain a correlation result of 1 time slot, anddetermining the time slot synchronization point according to the peak ofthe correlation result.
 12. The method according to claim 8, wherein theprocedure of determining the start-position of the WCDMA frame is asfollows: in the idle state, the data of 15 continuous time slots of theWCDMA adjacent cells is received according to the determined time slotsynchronization point, and the first 256 chips are taken out from eachtime slot to constitute a sequence A; the sequence A is correlatedsequentially with 15 secondary synchronization sequences of the WCDMAadjacent cells, a sliding step length is 256 chips, and thestart-position of WCDMA frame is determined according to the peak of 15correlation results; or in the connection state or the high speeddownlink packet access state, the data of one time slot of the WCDMAadjacent cell is received according to the time slot synchronizationpoint, and the data is correlated with each sequences in the secondarysynchronization sequence group of the cell, and if time slot numbercorresponding to the peak of the correlation results is one, thestart-position of the WCDMA frame is determined by the time slot number;if time slot number determined is two, then the data of one time slot ofthe WCDMA adjacent cells is received again, and the two determined timeslot numbers respectively plus the number of the time slots of the gapbetween the two receptions to obtain two possibilities of the time slotnumber of the data received this time, and the data received this timeis correlated with the secondary synchronization sequences correspondingto the two possible time slot numbers, and the time slot number of thedata received this time is determined according to the peak of thecorrelation results and the position where the WCDMA frame head appearsis determined according to the time slot number.
 13. The methodaccording to claim 8, wherein, after step D, the method furthercomprises: repeating step D, and then reporting to a higher layer theaverage value of the measurements of the received signal code powers oftwo times.
 14. The method according to claim 12, wherein, after step Dthe method further comprises: repeating step D, and then reporting to ahigher layer the average value of the measurements of the receivedsignal code powers of two times.
 15. The method according to claim 8,wherein, in step D, the de-spreading is performed according to thechannelization code and the primary scrambling code specifically used bythe common pilot channel.